Can you show me a photo of your N6ii info screen from Setting->System->About device?
OTA firmware update is incremental update, you can't upgrade from v1.xx to 2.2en directly, so not surprised that when you "start the update process, it does nothing".
You can upgrade from any firmware version to the latest version in one step with manual upgrade procedure. However, if your v1.xx firmware is a Chinese based version, then you cannot upgrade to firmware suffix with en, you can only upgrade to the latest Chinese version N6ii firmware v2.2 (download
HERE).